abi SetAssetMetadata {
    /// Stores metadata for a specific asset and key pair.
    ///
    /// # Arguments
    ///
    /// * `asset`: [AssetId] - The asset for the metadata to be stored.
    /// * `metadata`: [Metadata] - The metadata which to be stored.
    /// * `key`: [String] - The key for the metadata to be stored.
    ///
    /// # Example
    ///
    /// ```sway
    /// use standards::src7::{SRC7, Metadata};
    /// use sway_libs::asset::metadata::*;
    /// use std::string::String;
    ///
    /// fn foo(contract_id: ContractId, asset: AssetId, key: String, metadata: Metadata) {
    ///     let contract_abi = abi(SetAssetMetadata, contract_id.bits());
    ///     contract_abi.set_metadata(asset, metadata, key);
    ///     assert(contract_abi.metadata(asset, key).unwrap() == Metadata);
    /// }
    /// ```
    #[storage(read, write)]
    fn set_metadata(asset: AssetId, key: String, metadata: Metadata);
}